中科院化学研究所吴雨辰团队开发了斯托克斯光电探测器用手性二维钙钛矿纳米线。相关研究成果沿于2021年5月17日发表在《美国化学会杂志》。

多尺度结构工程允许将奇异特性集成到单一材料中，从而推动超紧凑型多功能器件的发展。层状钙钛矿能够交联源自少数钙钛矿结构的有效载流子输运，具有可设计的大块有机阳离子和纳米结构所提供的扩展功能，从而为多尺度材料工程提供了一个平台。

该文在溶液处理的手性钙钛矿纳米线阵列基础上，实现了用于任意偏振光检测的高性能斯托克斯参量光电探测器。钙钛矿层之间插入的手性铵离子对圆偏振光的响应最大各向异性因子为0.15，而具有各向异性介电函数的严格排列的纳米线对线偏振光的偏振比为1.6。单结晶度和纯结晶取向允许沿纳米线的高效面内载流子传输，产生47.1aW^–1的响应率和1.24 × 10¹³ Jones的探测率。利用线偏振和圆偏振响应与高光电性能的协同作用，在这些纳米线上实现了斯托克斯参量光电探测。

斯托克斯参量光电探测器具有体积小、性能高的特点，在偏振成像方面有着广阔的应用前景。

附：英文原文

Title: Chiral 2D-Perovskite Nanowires for Stokes Photodetectors

Author: Yingjie Zhao, Yuchen Qiu, Jiangang Feng, Jiahui Zhao, Gaosong Chen, Hanfei Gao, Yuyan Zhao, Lei Jiang, Yuchen Wu

Issue&Volume: May 17, 2021

Abstract: Structural engineering in multiple scales permits the integration of exotic properties into a single material, which boosts the development of ultracompact multifunctional devices. Layered perovskites are capable of cross-linking efficient carrier transport originating from few-layer perovskite frameworks with extended functionalities contributed by designable bulky organic cations and nanostructures, thus providing a platform for multiscale material engineering. Herein, high-performance Stokes-parameter photodetectors for arbitrary polarized light detection are realized on the basis of solution-processed chiral-perovskite nanowire arrays. The chiral ammonium  cations intercalated between the perovskite layers are responsive to circularly polarized light with a maximum anisotropy factor of 0.15, while the strictly aligned nanowires with the anisotropic dielectric function result in a large polarized ratio of 1.6 to linearly polarized light. Single crystallinity and pure crystallographic orientation permit efficient in-plane carrier transport along the nanowires, yielding a responsivity of 47.1 A W–1 and a detectivity of 1.24 × 1013 Jones. By synergy of linear- and circular-polarization response with high optoelectronic performance for providing sufficient photocurrent contrasts, Stokes-parameter photodetection is demonstrated on these nanowires. Our Stokes-parameter photodetectors with a small footprint and high performances present promising applications toward polarization imaging.

DOI: 10.1021/jacs.1c02675

Source: https://pubs.acs.org/doi/10.1021/jacs.1c02675